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dell dimension 8400 won't boot up! help!!!

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dell dimension 8400 won't boot up! help!!!

  • my computer will not boot up it beeps and the a and b lights is amber the c and d lights is green and the fan is running very fast.  i have replaced the motherboard and the power supply.  please help. thanks.

  • I wonder what the solution is because I have the same problem, the a and c leds are yellow (amber) which according to the manual suggests a problem with the graphics adapter. Reinstalling it isn't very helpful and I don't have a secondary (working) graphics adapter. Any suggestions?